I am unable to calculate using class? I am trying to access dynamic id using class

@foreach($room_types as $room_type)

{!! Form::text(‘cost’, null, [‘class’ => ‘form-control cost-‘.$room_type->id, ‘placeholder’ => ‘Enter Cost’]) !!}
{!! $errors->first(‘cost’,’:message’) !!}
@endforeach

and this is the script

$(‘.cost{{ $room_type->id }}’).keyup(function() {

                var roomTypeId = $(this).data('room-type-id');
                
                var cost           = parseFloat($('.cost').val());
                var profit         = parseFloat($('.profit').val());
                var tax_percentage = parseFloat($('.tax-percentage').val());

                checkNum('.cost'); 
                total_cost    = calculate_total_cost(cost, profit, tax_percentage);
                $('.total-cost').val(total_cost);

            });